US4868111A - Gram-positive expression control sequences - Google Patents

Gram-positive expression control sequences Download PDF

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US4868111A
US4868111A US07/875,437 US87543786A US4868111A US 4868111 A US4868111 A US 4868111A US 87543786 A US87543786 A US 87543786A US 4868111 A US4868111 A US 4868111A
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rbsii
sequence
promoter
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subtilis
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Hermann Bujard
Stuart Le Grice
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F Hoffmann La Roche AG
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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
    • C12N15/09—Recombinant DNA-technology
    • C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
    • C12N15/70—Vectors or expression systems specially adapted for E. coli
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
    • C12N15/09—Recombinant DNA-technology
    • C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
    • C12N15/74—Vectors or expression systems specially adapted for prokaryotic hosts other than E. coli, e.g. Lactobacillus, Micromonospora
    • C12N15/75—Vectors or expression systems specially adapted for prokaryotic hosts other than E. coli, e.g. Lactobacillus, Micromonospora for Bacillus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S435/00—Chemistry: molecular biology and microbiology
    • Y10S435/8215—Microorganisms
    • Y10S435/822—Microorganisms using bacteria or actinomycetales
    • Y10S435/832—Bacillus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S435/00—Chemistry: molecular biology and microbiology
    • Y10S435/8215—Microorganisms
    • Y10S435/822—Microorganisms using bacteria or actinomycetales
    • Y10S435/848—Escherichia
    • Y10S435/849—Escherichia coli

Definitions

  • the present invention relates to new gram-positive expression control DNA sequences, to expression vectors containing these DNA sequences, to host cells transformed with these expression vectors and to methods for producing pro- and eukaryotic proteins by using the new expression control DNA sequences, vectors and transformants.
  • E. coli Escherichia coli
  • E. coli is a member of the gram-negative class of bacteria which contain two layers of membranes enclosing a periplasmic space. Many of the products produced in E. coli are secreted into this periplasmic space, if secreted at all. Few products are secreted outside the living cells into the growth medium.
  • Bacillus subtilis (B. subtilis) is a member of the gram-positive class of bacteria which contain only a single layer of bacterial membrane. Thus B. subtilis can produce large amounts of protein which are secreted directly into the growth medium. Moreover, production of proteins in B. subtilis is advantageous since the organism is non-pathogenic and does not produce endotoxins. In addition, B. subtilis has been extensively studied and is the archetype for genetic studies among gram-positive microorganisms.
  • the known Bacillus subtilis promoters with the respective base sequences clarified include the veg promoter, tms promoter, pen P promoter (C.P. Moran Jr. et al., Mol. Gen. Genetics 186, 339-346 [1982]), spo VC promoter (C.P. Moran Jr. et al., Nucl. Acids Res. 9, 5979-5990 [1981]), spo VG promoter (C.P. Moran Jr. et al., Cell 25, 783-791 [1981]), ⁇ 29 G3a promoter, O 29 G3b promoter, O 29 G2 promoter, O 29 A1 promoter (C.L. Murray and J.C.
  • the present invention specifically provides gram-positive bacterial expression control DNA sequences comprising in the downstream direction of transcription a transcription initiation DNA sequence of gram-negative bacterial origin, a ribosome binding site-encoding DNA sequence of gram-positive or gram-negative bacterial origin optionally operatively linked to a foreign gene encoding prokaryotic or eukaryotic polypeptides, and a transcription termination DNA sequence of gram-negative or gram-positive bacterial origin.
  • This invention also provides a process for the manufacture of such expression control DNA sequences, which process comprises combining in the downstream direction (5' to 3') a transcription initiation DNA sequence of gram-negative bacterial origin, a ribosome binding site-encoding DNA sequence of gram-positive or gram-negative origin, and a transcription termination DNA sequence of gram-negative or gram-positive bacterial origin to a functional unit by techniques of DNA recombination well-known in the art.
  • a transcription initiation DNA sequence (promoter) of gram-negative bacterial origin with a ribosome binding site-encoding DNA sequence of gram-negative bacterial origin and a transcription termination DNA sequence of gram-positive bacterial origin.
  • E EcoRI; Sm: SmaI; B: BamHI; S: Sa1I; P: PstI; H: HindIII; Xh: XhoI; X: XbaI; K: KpnI; Pv: PvuII; A: AccI: Sp: SphI; Bg: Bg1II; D: DraI;
  • kan Structural gene for kanamycin nucleotidyl transferase
  • dhfr Structural gene for mouse dihydrofolate reductase
  • bla Structural gene for beta lactamase
  • DHFR Dihydrofolate Reductase protein
  • ori+ Gram positive origin of replication
  • ori- Gram negative origin of replication
  • SRBS Portable ribosome Binding Site-encoding synthetic DNA sequence
  • T1, T2, T7 Transcriptional terminator to, T1, T2, T7;
  • FIG. 1 Construction of the basic E. coli/B. subtilis shuttle vector p602/5, containing gram-positive (ori+) and gram-negative (ori-) origins of replication, together with drug resistance markers kanamycin (kan) and chloramphenicol. As such, this plasmid confers kanamycin resistance in both E. coli and B. subtilis. Chloramphenicol resistance is achieved through insertion of promoter-containing fragments between the EcoRI (E) and HindIII (H) sites.
  • E. coli cat gene presented here has its natural ribosome binding site-encoding DNA sequence.
  • subtilis a single fusion CAT protein is produced, originating from the ribosome binding site-encoding DNA sequences SRBSI or SRBSII. Plasmids p602/7, p602/25, p602/7RBSI and p602/7RBSII all confer chloramphenicol resistance in E. coli and B. subtilis.
  • FIG. 3 Construction of vectors p25RBSI, p25RBSII and p25*RBSII containing the coliphage T5 promoter P G 25 combined with the ribosome binding site-encoding synthetic DNA sequences SRBSI or SRBSII.
  • B. subtilis cells containing the vector p25RBSI synthesize a single CAT fusion protein, originating in the immediate downstream vicinity of SRBSI.
  • B. subtilis cells containing the vector p25RBSII synthesize two fusion CAT proteins, originating at the immediate downstream vicinity of SRBSII, as well as a longer fusion protein originating from a ribosome binding site in the immediate vicinity of P G 25.
  • Protein synthesis originating from this additional ribosome binding site was eliminated by providing a translational termination codon upstream from SRBSII, resulting in the vector p25*RBSII.
  • Cells containing p25*RBSII now synthesize a single fusion CAT protein, originating from SRBSII.
  • FIG. 4 Total proteins synthesized in B. subtilis strain BR151 containing the expression vectors p25RBSI, p25RBSII and p25*RBSII.
  • the position of the CAT protein originating from SRBSI or SRBSII is indicated ⁇ CAT ⁇ ; the additional fusion CAT protein from cells harbouring p25RBSII is indicated ⁇ f-CAT ⁇ .
  • LYS indicates lysozyme, which is added externally to aid cell lysis.
  • FIG. 5 Diagramatic representation of CAT proteins synthesized in B. subtilis containing the vectors p25RBSI, p25RBSII and p25*RBSII.
  • An in-frame translational stop codon ( ) prevents read through protein synthesis into the cat gene from P G 25 RBS.
  • Such an in-frame stop codon is absent in the construction p25RBSII; consequently, cat proteins arise from RBS and SRBSII.
  • Modification of the HindIII site in p25*RBSII introduces an in-frame stop codon, and, as a consequence, yields a single CAT protein from SRBSII.
  • FIG. 6 In vitro transcriptional analysis of the promoters presented in Table 1.
  • the notations ⁇ Ec ⁇ and ⁇ Bs ⁇ indicate analysis with E. coli and B. subtilis RNA polymerase, respectively, and the figures in conjunction with these notations give the salt concentration at which the transcription was performed.
  • ⁇ ori ⁇ and ⁇ bla ⁇ transcripts arise from the vector into which the promoters were cloned.
  • the panel indicated ⁇ veg ⁇ represents transcription of solely the B. subtilis veg promoter (Le Grice, S. F. J. and Sonenshein, A. L. J. Mol.Biol., 162, 551-564, 1982).
  • ⁇ veg ⁇ indicated at the side of the panel indicates transcription of internally supplied veg promoter DNA.
  • M molecular weight marker
  • FIG. 7 Construction of the shuttle vectors p602/18 and p602/19, containing the coliphage T5 promoter P N 25 operably linked to either the the synthetic ribosome binding site-encoding DNA sequence RBSII, 9A (p602/18) or RBSII, 3A+5A (p602/19). Insertion of the synthetic ribosome binding site-DNA encoding sequences leads, in both cases, to synthesis of a fusion CAT protein initiating in the immediate vicinity of the synthetic ribosome binding site and terminating at the natural translational stop codon of the cat gene. Plasmids p602/18 and 602/19 both confer chloramphenicol resistance on B. subtilis.
  • FIG. 8 Construction of the shuttle vectors p602/20 and p602/21, containing the coliphage T5 promoter P N 25 operably linked to the synthetic ribosome binding site-encoding DNA sequences RBSII (p602/20) or RBSII,3A+5A (p602/21). Insertion of the synthetic ribosome binding site-DNA encoding sequences leads, in both cases, to synthesis of a fusion DHFR protein, initiating in the immediate vicinity of the synthetic ribosome binding site and terminating at the natural translational termination codon of the dhfr gene.
  • B. subtilis cells containing 602/20 or 602/21 are resistant to 10 ⁇ g/ml trimethoprim.
  • FIG. 9 Total proteins synthesised in B. subtilis strain BR151 containing the plasmids p602/18, p602/19, p602/20 and p602/21.
  • ⁇ Cell ⁇ denotes protein synthesis from plasmid-free cells.
  • CAT synthesis from p25*RBSII has been included.
  • the positions of the fusion CAT protein CAT* (from p602/18 and p602/19) and fusion DHFR protein (from p602/20 and p602/21) have been indicated.
  • bacterial origin used in connection with transcription initiation DNA sequences comprises (a) naturally occurring bacterial transcription initiation sequences and functional variations thereof including substitutions or inversions of single or several nucleotides and repeats of such transcription initiation DNA sequences and (b) chemically synthesized (synthetic) transcription DNA sequences capable of initiating transcription in bacteria.
  • bacterial origin used in connection with ribosome binding site-encoding DNA sequences comprises (a) naturally occurring bacterial ribosome binding site-encoding DNA sequences and functional variations thereof including substitutions or inversions of single or several nucleo-tides and (b) chemically synthesized (synthetic) ribosome binding site-encoding DNA sequences capable of initiating translation in bacteria.
  • bacterial origin used in connection with transcription terminationDNA sequences comprises (a) naturally occurring bacterial transcription termination DNA sequences and functional variations thereof including substitutions or inversions of single or several nucleotides and repeats of such transcription termination DNA sequences and (b) chemically synthesized (synthetic) transcription termination DNA sequences capable ofterminating transcription in bacteria.
  • genes encoding prokaryotic or eukaryotic proteins can be expressed in Bacillus, particularly B. subtilis, and othergram-positive organisms under the transcriptional control of coliphage T5 or T7-derived promoters and E. coli-derived terminators.
  • T5 and T7 promoters are defined as promoter function-mediating DNA sequences occurring in genomes of the coliphage T5 and T7 family and functional combinations derived from such sequences.
  • T5 promoters useful in the present invention are those of the "preearly” “early” and “late” expression class of the phage, especially the sequencesdescribed in the dissertation of R. Gentz, Universitat Heidelberg, 1984: P J 5, P N 25, P N 26, P D/E 20, P G 5, P G 20, P G 22, P G 25, P G 28, P K 28a, P K 28b.
  • the T7 promoters useful in the present invention include the "early" expression class of the phage, especially the promoters A1 and A2 (Hawley,D.K. and McClure, W.D., Nucleic Acids Res. 11, 2237-2255 [1983]).
  • Table I shows the nucleotide sequence of the promoters used in the present invention. The sequence between -50 and +10 is presented, within which the -35 hexamers and upstream A:T-rich regions are boxed, while the -10 hexamers are overlined.
  • the ribosome binding site-encoding DNA sequence which is necessary for the initiation of translation in a host cell consists of (1) an ATG translation initiation codon for the amino acid methionine, (2) a sequenceof 4 to 12 bases which are complementary to bases at the 3'-end of 16s ribosomal RNA and which is known as the Shine Dalgarno (SD) sequence and (3) a sequence of bases between these two known as the linker region.
  • SD Shine Dalgarno
  • the ribosome binding site-encoding DNA sequences used in the present invention and forming part of it may be provided by ribosome binding site-encoding sequences of gram-positive or gram-negative origin capable of functioning in Bacillus, particularly B. subtilis, and other gram-positive organisms, inclusive of several known ones (J.R. McLaughlin et al., J. Biol. Chem. 256, 11283-11291 [1981]; C.P. Moran Jr. et al., Mol. Gen. Genetics 186, 339-346 [1982]).
  • SRBS portable ribosome binding site-encoding synthetic RNA sequences
  • SRBSs have been constructed in a form so that they can function in conjunction with any desired gene encoding prokaryotic or eukaryotic polypeptides in Bacillus, particularly B. subtilis, and other gram-positive organisms. The ability to so function renders the SRBS "portable”.
  • the transcription termination DNA sequence may be provided by terminators of gram-negative bacterial origin capable of functioning in Bacillus, particularly B. subtilis, and other gram-positive organisms.
  • the preferredgram-negative terminators used in this invention include the E. coli-derived terminators t o (M. Rosenberg et al., Proc. Natl. Acad. Sci. U.S.A. 73, 717-721 [1976], T1, T2 (J. Brosius et al., J. Mol. Biol. 148, 107-127 [1981]and T7 (J.J. Dunn and Studier, F.W., Nucleic Acids Res.8, 2119-2132 [1980].
  • the transcription initiation DNA sequences, the portable ribosome binding site-encoding sequences and the transcription termination sequences of thepresent invention can be obtained in accordance with methods well-known in DNA chemistry including total chemical synthesis of the respective DNA sequence, e.g., in a nucleotide synthesizer.
  • the invention further comprises expression vectors capable of directing expression of a gene encoding pro- and eukaryotic proteins in a bacillus, particularly B. subtilis or another gram-positive organism transformed therewith, containing (a) a gram-positive bacterial expression control DNAsequence having in the downstream direction of transcription the following units: at least one transcription initiation DNA sequence of gram-negativebacterial origin combined with a ribosome binding site encoding DNA sequence of gram-positive or gram-negative origin, optionally a foreign gene encoding prokaryotic or eukaryotic polypeptides and a transcription termination DNA sequence, (b) at least one vector origin of replication and (c) at least one antibiotic resistance gene as well as a process for the manufacture of such expression vectors.
  • expression vectors capable of directing expression of a gene encoding pro- and eukaryotic proteins in a bacillus, particularly B. subtilis or another gram-positive organism transformed therewith, containing (a) a gram-positive bacterial
  • the transcription initiation DNA sequence may be provided by a gram-negative promoter.
  • the preferred gram-negative promoters used are coliphage T5 or coliphage T7 promoters with the formulae indicated in Table 1.
  • the origin of replication may be of gram-negative and/or gram-positive origin and thus the expression vectors can be employed as shuttle vectors (Ehrlich, S.D., Proc. Natl. Acad. Sci. U.S.A. 75, 1433-1436 [1978]; Kreft,J. et al., Molec, gen. Genet. 162, 59-67 [1978]; Michel, B. et al., Gene 12, 147-154 [1980]), which can replicate both in E. coli and Bacillus, especially B. subtilis.
  • Preferred expression vectors using ribosome binding site-encoding synthetic DNA sequences ligated to a coliphage T5 promoter and capable of replicating both in E. coli and B. subtilis are described in Examples 4, 5 and 7 to 10, infra.
  • the expression vectors of the present invention can be constructed using techniques of DNA recombination that are well known in the art (see laboratory manual "Molecular Cloning” by Maniatis et al., Cold Spring Harbor Laboratory, 1982) comprising the steps of:
  • Plasmids of the p602 and p25 families are specific examples of plasmidic shuttle vectors of the present invention. Their preparation is described in more detail in Examples 1 to 5 and 7 to 10.
  • B. subtilis strains containing the especially preferred plasmids of the p25 family (B. subtilis BR151 transformed with p25RBSI; p25RBSII; p25*RBSII) were deposited at Deutsche Sammlung von Mikroorganismen (DSM) in Gottingen on June 20, 1985, the accession Nos. being DSM 3350, DSM 3351 and DSM 3352, respectively.
  • B. subtilis strains containing the especially preferred plasmids of the p602 family B.
  • subtilis BR 151 transformed with p602/18; p602/19; p602/20; p602/21) were deposited at Deutsche Sammlung von Mikroorganismen (DSM) in Gottingen on May 14, 1986, the accession Nos. being DMS 3723, DSM 3724, DSM 3725 and DSM 3726, respectively.
  • Foreign genes that may be inserted into the expression vectors of this invention may be selected from a large variety of genes (DNA genes or DNA copies of RNA genes) that encode prokaryotic or eukaryotic polypeptides invivo and in vitro.
  • genes may encode enzymes, hormones, polypeptides with immuno-modulatory, anti-viral or anti-cancer properties,antibodies, antigens, and other useful polypeptides of prokaryotic or eukaryotic origin.
  • the preferred foreign genes used in this invention are the genes encoding E. coli chloramphenicol acetyltransferase (cat) and mouse dihydrofolate reductase (dhfr).
  • proteins which can be expressed by using the improved expression control system of the present invention are dihydrofolate reductase, chloramphenicol acetyltransferase, malaria surface antigens, lymphokins like IL-2, interferons alpha, beta and gamma, insulin and insulin precursors, growth hormones, tissue plasminogen activator, human renin or HTLV-III proteins.
  • Methods for expressing genes encoding prokaryotic or eukaryotic proteins using the expression vectors, especially shuttle vectors, of this invention are well-known (Maniatis et al., supra). They include transforming an appropriate host with an expression vector having the desired DNA sequence operatively inserted into an expression control DNA sequence of the present invention, culturing the host under appropriate conditions of growth and isolating the desired polypeptide from the culture. Those of skill in the art may select from these known methods those that are most effective for a particular gene expression without departing from the scope of this invention.
  • a particular host for use in this invention is dependent upon a number of factors recognized by the art. These include, for example, compatability with the chosen expression vector, toxicity of the proteins encoded for by the hybrid plasmid, ease of recovery of the desired protein, expression characteristics, biosafety and costs.
  • examples of useful bacterial hosts are gram-negative and gram-positive bacteria, especially strains of E. coli and B. subtilis.
  • the most preferred host cell of this invention is B. subtilis BR 151 (stocked at The Bacillus Genetic Stock Center under BGSC No. 1A40).
  • B. subtilis strains such as B. subtilis BD 170 (stocked at The Bacillus Genetic Stock Center under BGSC No. 1A 42) and B.subtilis JH646 (stocked at The Bacillus Genetic Stock Center under BGSC No.1S9) can also be used.
  • Transformation of DNA into cells of B. subtilis was performed as described by S. Contente and obnau, D. (Mol. Gen. Genet 167, 251-258 [1979]).
  • RNA polymerases of E. coli and B. subtilis were performed in 50 ul assays of the following composition; 40 mM Tris/HC1, pH7.9, 10 mM MgC1 2 , 0,1 mM DTT, 0,1 mM EDTA, 50-200 mM NaC1, 10% (v/v) glycerol, 150 ⁇ M ATP, GTP, CTP, 50 ⁇ M UTP, 5 uCi 32 P-UTP ( ⁇ 3000 Ci/m mole, Amersham Buchler, Braunschweig), 0,05 p mole endonucleolytically-cleaved DNA, and 0,25 p mole RNA polymerase.
  • RNA polymerase Reactionswere initiated by addition of RNA polymerase and allowed to proceed for between 1 and 5 mins at 37° C. Synthesized RNA was isolated by repeated ethanol precipitation and analyzed by high voltage gel electrophoresis through 0.4 mm thick 5 or 8% polyacrylamide gels containing 8M urea. Following electrophoresis, gels were dried and subjected to autoradiography using Kodak X-OMAT XAR 5 film at room temperature.
  • the KpnI/XbaI fragment was subsequently purified from the acrylamide gel slice.
  • (III) Five ⁇ g of plasmid pDS5 were digested to completion with the endonucleases EcoRI and XbaI and then separated by electrophoresis through a 1% low melting temperature agarose gel containing 1 ⁇ g/ml ethidium bromide. Following electrophoresis, the DNAbands were visualized by fluorescence, and an approximately 900 bp EcoRI/SbaI fragment was excised. The EcoRI/XbaI fragment was subsequently purified from the low melting temperature agarose.
  • the ligation products were transformed into E. coli strain AB1157, and transformed cells were selected on LB agar containing 50 ⁇ g/ml chloramphenicol. Chloramphenicol-resistant colonies were analyzed to verify the insertion of promoter PvII into the plasmid p602/5. The resultant plasmid was designated p602/7.
  • II Two ⁇ g of plasmid p602/7 were digested to completion with the endonuclease HindIII.
  • the portable ribosome binding site-encoding synthetic DNA sequence SRBSI, having the sequence ##STR12## was ligated into the HindIII site.
  • the ligation products were transformed into E.
  • Plasmid DNA thus characterized was designated p602/7RBSI.
  • Purified p602/7RBSI DNA was thereafter transformed into B. subtilis strain BR151, and chloramphenicolresistant colonies (in this case, colonies resistant to10 ug/ml chloramphenicol) were assayed as mentioned in (II) a) and b) to verify the utility of SRBS I in B. subtilis.
  • Plasmid p602/7RBSI was digested to completion with HindIII and SphI and purified from SRBSI by electrophoresis through a 1% low melting temperature agarose gel containing 1 ⁇ g/ml ethidium bromide. Following electrophoresis, the DNA was visualized by fluorescence and excised from the gel. The DNA was subsequently purified from the agarose.
  • a portable ribosome binding site-encoding synthetic DNA sequence, designated SRBSII, and having the sequence ##STR13## was ligated with HindIII/SphI cleaved p602/7RBSI DNA.
  • Plasmid DNA thus characterized was designated p602/7RBSII.
  • Plasmid p602/7RBSII was introduced into competent cells of B. subtilis strain BR151, and transformed cells were selected on LB agar containing 10 ug/ml chloramphenicol. Chloramphenicol-resistant colonies were analyzed for the utility of SRBSII in B. subtilis as described in Step (III) a) and b).
  • Theconstruction of vectors p602/7RBSI and p602/7RBSII is illustrated in FIG. 2.
  • Plasmid DNA was isolated from E. coli harbouring p25RBSI and transformed into competent cultures of B. subtilis strain BR151, and transformed cells were selected on LB agar containing 10 ⁇ g/ml chloramphenicol. Plasmid DNA was isolated from chloramphenicol resistant colonies, and the structure of plasmid p25RBSI in B. subtilis was verifiedby restriction endonuclease analysis.
  • Plasmid DNA was isolated from chloramphenicol resistant colonies, and the presence of both the coliphage T5 promoter P G 25 and the synthetic ribosome binding site-encoding DNA sequence SRBSII were verified by restriction endonuclease analysis. Plasmid DNA thus characterized was designated p25/RBSII. The construction of plasmid p25RBSII is illustrated in FIG. 3.
  • FIG. 4 Protein synthesis in B. subtilis containing the vector p25RBSII is illustrated in FIG. 4. It was discovered here that the EcoRI fragment harbouring the promoter P G 25 contains an accessory ribosome binding site which produces a fusion protein extending to the end of the cat gene. The immediate effect is to drastically reduce the efficiency of RBSII. As aconsequence, the protein reading frame from the ribosome binding site in the immediate vicinity of P G 25 was altered as follows, to maximize protein synthesis from SRBSII:
  • (V) PLasmid p25*RBSII was introduced into competent cultures of B. subtilisstrain BR151, and transformed cells were selected on LB agar containing 10 ⁇ g/ml chloramphenicol. Plasmid DNA was then isolated from chloramphenicol resistant colonies and its structural identity to p25*RBSII isolated from E. coli was determined by restriction endonucleaseanalysis.
  • Table 1 indicates the promoters which were used. Their potential was determined by in vitro ⁇ run-off ⁇ transcription, the results of which are presented in FIG. 6. In each case, promoter utilization by B. subtilis ⁇ 55 RNA polymerase was determined as a function of increasing ionic strength and compared with its efficiency when transcribed with E. coli RNA polymerase in 200 mM NaC1. Each transcription assay contained, inaddition to the promoter in question, stoichiometric amounts of the B. subtilis veg promoter, previously shown to be efficiently utilized by B. subtilis ⁇ 55 RNA polymerase (Moran Jr. et al., Mol. Gen. Genetics 186, 339-346 [1982]).
  • subtilis RNA polymerase initiates transcription not only from the promoters in question, but also from the ⁇ bla ⁇ and ⁇ ori ⁇ promoters of the pBR322 vector DNA (for preliminary studies, all promoters were inserted into pBR322 derived vectors: these plasmids were subsequently cleaved to yield a constant 350 nucleotide ⁇ bla ⁇ transcript and a variable length transcript from the coliphage T5 promoter in question). As the salt concentration is raised, promoter selection becomes clearly evident, partitioning between the veg and coliphage T5 promoters.
  • coliphage T5 promoters or the A1 promoter of coliphage T7, can be substituted for the P G 25 promoter of the vector p25*RBSII (FIG. 3), and CAT synthesis inB. subtilis can be determined.
  • Plasmid DNA was purified from transformants resistant to 10 ⁇ g/ml kanamycin and 10 ug/ml chloramphenicol and assayed for the presence of the 1.0 Kb XhoI/XbaI fragment. Plasmid DNA thus characterized was designated p602/19. The construction of p602/19 is illustrated in FIG. 7.
  • Plasmid DNA was purified from transformants resistant to 10 ⁇ g/ml kanamycin and 10 ug/ml trimethoprim and analyzed for the presence of the 2.0 Kb XhoI/XbaI fragment. Plasmid DNA thus characterized was designated p602/20. The construction of p602/20 is illustrated in FIG. 8.

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WO1999016858A1 (fr) * 1997-09-30 1999-04-08 Human Genome Sciences, Inc. Sequences de regulation de l'expression
US6146848A (en) * 1998-07-23 2000-11-14 The Hong Kong University Of Science & Technology Bacterial expression system
US20030143685A1 (en) * 2001-10-26 2003-07-31 Id Biomedical Corporation Of Washington Efficient protein expression system
US6924105B2 (en) * 2000-10-25 2005-08-02 Fuji Photo Film Co., Ltd. Method of analyzing double stranded DNA
US20110033438A1 (en) * 2006-10-18 2011-02-10 Periness Ltd. Method and pharmacological composition for the diagnosis and treatment of male
WO2016073079A2 (fr) 2014-09-26 2016-05-12 Yale University Compositions et procédés pour le confinement biologique de microorganismes
US11149280B2 (en) 2019-10-29 2021-10-19 Yale University Engineering organisms resistant to viruses and horizontally transferred genetic elements
WO2023178316A2 (fr) 2022-03-17 2023-09-21 Yale University Compositions et méthodes d'expression d'éléments génétiques synthétiques chez divers micro-organismes

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GB2278358B (en) 1992-02-27 1995-07-26 Lynxvale Ltd Heterologous gene expression in Lactococcus,and the expression products therefrom
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CA2545610C (fr) 2003-11-19 2014-03-25 Dow Global Technolgies Inc. Bacterie pseudomonas fluorescens auxotrophique pour expression de proteine recombinante
EP2327718B1 (fr) 2003-11-21 2016-03-23 Pfenex, Inc. Systèmes d'expression ameliorés à sécrétion du système SEC
KR20120076377A (ko) 2004-01-16 2012-07-09 다우 글로벌 테크놀로지스 엘엘씨 슈도모나스 플루오레센스에서의 포유류 단백질의 발현
CN101031655A (zh) 2004-07-26 2007-09-05 陶氏环球技术公司 通过株工程改进蛋白表达的方法
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US6022730A (en) * 1994-06-17 2000-02-08 Robinson; Douglas H. Methods for the isolation of bacteria containing eukaryotic genes
WO1998013472A1 (fr) * 1996-09-25 1998-04-02 Robinson Douglas H Procede de production de bacteries contenant des genes eucaryotes
WO1999016858A1 (fr) * 1997-09-30 1999-04-08 Human Genome Sciences, Inc. Sequences de regulation de l'expression
US6194168B1 (en) * 1997-09-30 2001-02-27 Human Genome Sciences, Inc. Expression control sequences
US6420138B1 (en) 1997-09-30 2002-07-16 Human Genome Sciences, Inc. Expression control sequences
US6146848A (en) * 1998-07-23 2000-11-14 The Hong Kong University Of Science & Technology Bacterial expression system
US6924105B2 (en) * 2000-10-25 2005-08-02 Fuji Photo Film Co., Ltd. Method of analyzing double stranded DNA
US6939959B2 (en) 2001-10-26 2005-09-06 Id Biomedical Corporation Of Washington Efficient protein expression system
US20030143685A1 (en) * 2001-10-26 2003-07-31 Id Biomedical Corporation Of Washington Efficient protein expression system
US20050287642A1 (en) * 2001-10-26 2005-12-29 Id Biomedical Corporation Of Washington Efficient protein expression system
US20070148731A9 (en) * 2001-10-26 2007-06-28 Id Biomedical Corporation Of Washington Efficient protein expression system
US7528245B2 (en) 2001-10-26 2009-05-05 Id Biomedical Corporation Of Washington Efficient protein expression system
US20110033438A1 (en) * 2006-10-18 2011-02-10 Periness Ltd. Method and pharmacological composition for the diagnosis and treatment of male
US9149513B2 (en) 2006-10-18 2015-10-06 Periness Ltd. Method and pharmacological composition for the diagnosis and treatment of male sub-fertility
WO2016073079A2 (fr) 2014-09-26 2016-05-12 Yale University Compositions et procédés pour le confinement biologique de microorganismes
US11408007B2 (en) 2014-09-26 2022-08-09 Yale University Compositions and methods for biocontainment of microorganisms
US11149280B2 (en) 2019-10-29 2021-10-19 Yale University Engineering organisms resistant to viruses and horizontally transferred genetic elements
WO2023178316A2 (fr) 2022-03-17 2023-09-21 Yale University Compositions et méthodes d'expression d'éléments génétiques synthétiques chez divers micro-organismes

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IL79291A (en) 1991-06-30
GB8517071D0 (en) 1985-08-14
DK320686A (da) 1987-01-06
DK175206B1 (da) 2004-07-12
IL79291A0 (en) 1986-09-30
DK320686D0 (da) 1986-07-04
IE59165B1 (en) 1994-01-12
EP0207459A3 (en) 1988-07-06
IE861806L (en) 1987-01-05
ATE62020T1 (de) 1991-04-15
EP0207459A2 (fr) 1987-01-07
AU5938586A (en) 1987-01-08
AU594349B2 (en) 1990-03-08
CA1316850C (fr) 1993-04-27
JPH10229878A (ja) 1998-09-02
JP2632809B2 (ja) 1997-07-23
DE3678343D1 (de) 1991-05-02
JP2887248B2 (ja) 1999-04-26
NZ216688A (en) 1990-06-26
EP0207459B1 (fr) 1991-03-27
JPS6214786A (ja) 1987-01-23

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